back-portable TableView DiffableDataSource

Sources/Differentiable.swift

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+//
+//  Differentiable.swift
+//  CoreStore
+//
+//  Copyright © 2018 John Rommel Estropia
+//
+//  Permission is hereby granted, free of charge, to any person obtaining a copy
+//  of this software and associated documentation files (the "Software"), to deal
+//  in the Software without restriction, including without limitation the rights
+//  to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+//  copies of the Software, and to permit persons to whom the Software is
+//  furnished to do so, subject to the following conditions:
+//
+//  The above copyright notice and this permission notice shall be included in all
+//  copies or substantial portions of the Software.
+//
+//  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+//  IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+//  FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+//  AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+//  LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+//  OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+//  SOFTWARE.
+//
+
+import Foundation
+
+
+// MARK: - Differentiable
+
+@usableFromInline
+internal protocol Differentiable {
+
+    associatedtype DifferenceIdentifier: Hashable
+
+    var differenceIdentifier: DifferenceIdentifier { get }
+
+    func isContentEqual(to source: Self) -> Bool
+}
+
+extension Differentiable where Self: AnyObject {
+
+    // MARK: Internal
+    
+    internal var differenceIdentifier: ObjectIdentifier {
+    
+        return .init(self)
+    }
+}
+
+
+// MARK: - DifferentiableSection
+
+@usableFromInline
+internal protocol DifferentiableSection: Differentiable {
+    
+    associatedtype Collection: Swift.Collection where Collection.Element: Differentiable
+    
+    var elements: Collection { get }
+
+    init<S: Sequence>(source: Self, elements: S) where S.Element == Collection.Element
+}